Chair with ventilating device for theaters, biographs, and the like



B. MOLLBERG. I CHAIR WITH VENTILATING DEVICE FOR THEATERS, BIOGRAPHS, AND THE LIKE.

APPLICATION FILED JULY 9, i920- atented Mar. 8, 1921.

rial.

UNITED STATES PATENT OFFICE.

BROR MOLLBERG, F GOTTENBORG, SWEDEN.

CHAIR WITH VENTILATING DEVICE FOR THEATERS, BIOGRAPHS, AND THE LIKE.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed July 9, 1920. Serial No. 395,012.

To all whom it may concern:

Be it known that I, Bnon MOLLBERG, a

subject of the King of Sweden, residing at ing is a specification.

In ventilating appliances for theaters, biographs, concert-halls or other closely occupied assembly rooms, air-drums have been provided below the chairs for supplying ventilating air or withdrawing foul air from the room, and air conduits located be tween the legs of the chairs have been connected with said drums, the sides of the conduits being grated to permit passage of the air. For the purpose of making the most advantageous use of the available space of the room, the chairs usually are'arranged as close together as possible and the seats of the chairs are mounted to permit the same to swing up when they are unoccupied. The space available for the mentioned air conduits is considerably limited and the air conduits being necessarily narrow cause the air currents to travel rapidly and hence produce undesired drafts.

The present invention has for its object to improve chairs of the kind mentioned, and the improvements not only remove said disadvantages but also permit the air to be regulated in a desired manner.

The invention consists in providing air conduits between the legs of the chairs, and these conduits are ta ered at their upper portions to provide t e necessary space to permit the chair seats to be swung. Each air conduit is also provided with a regulatin damper.

In the accompanying drawing, an embodiment of the invention is shown, in which:

Figure 1 is a front elevation partly in section of a row of chairs;

Fig. 2 a horizontal top view of the same in section;

Fig. 3 an end elevation of the same;

Fig. 4 a top view of another embodiment;

Fig. 5 a section of a detail; and

Fig. 6 a section of another detail.

Below the seats 1 of the chairs, air conduits 3 are provided between each pair of front and rear legs 2, each conduit 3 being provided with grates 4 and connected with air-drums arranged below the floor. In the conduit 3, a damper 5 is arranged and this damper 1s rlgldly mounted on a shaft 6, which extends to the exterior of the conduit and is provided with threads engaged by a nut 7 the end of the shaft being provided with a notch 8, as shown in Fig. 5.

Fig. 4 shows a horizontal section of an embodiment including a cylindrical air conduit B, and this conduit is also tapered upwardly, so that the seats 1 of the chairs may be freely swung vertically.

Folding chairs now in general use have, as before mentioned and shown in the drawing, seats 1 which may be swung up, whereby the rear portions of the seats swing downward. The conduit 3 must, therefore,

be narrow or tapered at its upper end, so that suflicie'nt space is provided to permit the seats to swing freely without the necessity of increasing the breadth of the side pieces of the chairs. The upward tapering of the air conduits 3 permits the use of conduits which are sufliciently wide through the greater portion of their height to convey comparatively great quantities of air.

The square section of each of the conduits 3 is of about the same size from the floor to the grates 4, but the section gradually decreases from this point upwardly, and as the air discharges through the grates at a point adjacent the wide section of the conduit, the speed of the air current will not be increased by reason of the air conduit being upwardly tapered.

In such ventilating devices for theaters, etc, as here referred to, on account of the different chairs being located various distances from the fan, it is necessary to regulate in a suitable way the air supply for each chair, so that the air supply becomes equal for all chairs. If not suitably regulated, the air will pass through the conduits 3, which are arranged nearest the fan and less air will discharge through the conduits which are. farther away from the fan. Such regulation is readily accomplished by means of the dampers 5. By applying a screw driver to the notch 8, the damper may be turned and by tightening the nut 7, the adjusted damper may be locked in its intended position for preventing any unauthorized person from altering the positionof the damper. By arranging the notch 8 parallel to the plane of the damper, the position of the latter will be indicated from the exterior of the conduit.

In order to facilitate attachment of the side plates 31 of the conduits 3, see Fig. (5, between the front and rear legs of the chair, the edges 32 of said plates are inserted in corresponding grooves in the legs of the chair.

What is claimed and desired to be secur by Letters-Patent is 1. In combination, a floor having an air duct arranged beneath the same, a series of alined chair legs arranged on said floor in spaced relation to one another, each chair leg consisting of front and rear members spaced apart, an air conduit arranged between the front and rear members of each chair leg and having its side walls tapered upwardly, the tapered portions of said walls being perforated to'permit the exit of air laterally from the chair legs, and pivotally mounted seats located between said legs and having portions movable between the tapered portions of said air conduits.

2. A chair including a vertically swinging seat, legs supporting said seat and provided with air conduits, the upper portions of said legs being perforated and upwardly tapered to permit swinging of the chair seat between the upper portions of the conduits, dampers arranged in said conduits, a rod secured to each damper and extending through the chair legs, one of the outer ends of each rod being notched and screw-threaded,'and a nut engaging-the threads of each rod for locking the dampers in adjusting position.

In testimony whereof I have afiixed my signature.

BROR MOLLBERG. 

